var tbody = document.getElementById('body'); //tbody节点
			for (var i = 0; i < tbody.children.length; i++) {
				tbody.children[i].style.backgroundColor = '#ffffff';
				//实现鼠标移入高亮
				tbody.children[i].onmouseenter = function() {
					this.style.backgroundColor = '#f7f7f7';

				}
				tbody.children[i].onmouseleave = function() {
					this.style.backgroundColor = '#ffffff';
				}
			}
